/Engine/Plugins/Online/OnlineServicesEOS/Source/Public/Online/AuthEOS.h
Queries a ticket which is appropriate for making server-to-server calls on behalf of the signed in user. Tickets are intended to be single use - users must call the API again to retrieve a new ticket when making repeated calls which use a ticket.
virtual [TOnlineAsyncOpHandle](API\Plugins\OnlineServicesInterface\Online\TOnlineAsyncOpHandle)< [FAuthQueryExternalServerAuthTicket](API\Plugins\OnlineServicesInterface\Online\FAuthQueryExternalServerAuthTick-) > QueryExternalServerAuthTicket ( [FAuthQueryExternalServerAuthTicket::Params](API\Plugins\OnlineServicesInterface\Online\FAuthQueryExternalServerAuthTick-\Params) && Params )